document.write( "Question 944323: A triangle has one angle that measures 69° and one angle that measures 21°. \r
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Algebra.Com's Answer #575773 by macston(5194)\"\" \"About 
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The sum of the angles of a triangle are 180 degrees,
\n" ); document.write( "Let X be the unknown angle
\n" ); document.write( "69+21+X=180
\n" ); document.write( "90+X=180 Subtract 90 from each side
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\n" ); document.write( "ANSWER A triangle with a 90 degree angle is by definition a right triangle.
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